Respuesta :

Answer: -

Al₂O₃

Explanation: -

The atomic number of aluminium Al = 13

The electronic configuration of aluminium =2,8,3

To have 8 electrons in it's valence shell, it must lose 3 electrons.

So the valency of Al is +3.

The atomic number of oxygen is 8

The electronic configuration of O oxygen = 2,6

So to have 8 electrons in it's valence shell it must gain 2 electrons.

Thus the valency of O = -2.

The formula for aluminium oxide = Al ⁺³ O²⁻

= Al₂O₃

Answer:

The formula is AI203

Explanation: